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Thailand's oldest and most visited national park, this Unesco World Heritage site is a must see on any trip to the country. At 2168 square kilometers, Khao Yai remains one of the largest rainforests on mainland Asia. With around 200 elephants, as well as many tigers, leopards, bears, monkeys, gaur, barking deer, otters, various gibbons, macaques, pythons, and 392 species of bird, the park is home for many creatures.